404 GET /nbextensions/widgets/notebook/js/extension.js

Hello all,

I am getting this error whenever I start jupyter notebook:

404 GET /nbextensions/widgets/notebook/js/extension.js?v=20210106171402 (127.0.0.1) 14.260000ms referer=http://localhost:8888/notebooks/Downloads/Untitled.ipynb

What should I do to fix it?

Thank you!